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ucsi.c
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ucsi.c
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// SPDX-License-Identifier: GPL-2.0
/*
* USB Type-C Connector System Software Interface driver
*
* Copyright (C) 2017, Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*/
#include <linux/completion.h>
#include <linux/property.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/usb/typec_dp.h>
#include "ucsi.h"
#include "trace.h"
/*
* UCSI_TIMEOUT_MS - PPM communication timeout
*
* Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI
* specification) here as reference, but unfortunately we can't. It is very
* difficult to estimate the time it takes for the system to process the command
* before it is actually passed to the PPM.
*/
#define UCSI_TIMEOUT_MS 5000
/*
* UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests
*
* 5 seconds is close to the time it takes for CapsCounter to reach 0, so even
* if the PPM does not generate Connector Change events before that with
* partners that do not support USB Power Delivery, this should still work.
*/
#define UCSI_SWAP_TIMEOUT_MS 5000
static int ucsi_acknowledge_command(struct ucsi *ucsi)
{
u64 ctrl;
ctrl = UCSI_ACK_CC_CI;
ctrl |= UCSI_ACK_COMMAND_COMPLETE;
return ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
}
static int ucsi_acknowledge_connector_change(struct ucsi *ucsi)
{
u64 ctrl;
ctrl = UCSI_ACK_CC_CI;
ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
return ucsi->ops->async_write(ucsi, UCSI_CONTROL, &ctrl, sizeof(ctrl));
}
static int ucsi_exec_command(struct ucsi *ucsi, u64 command);
static int ucsi_read_error(struct ucsi *ucsi)
{
u16 error;
int ret;
/* Acknowlege the command that failed */
ret = ucsi_acknowledge_command(ucsi);
if (ret)
return ret;
ret = ucsi_exec_command(ucsi, UCSI_GET_ERROR_STATUS);
if (ret < 0)
return ret;
ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error));
if (ret)
return ret;
switch (error) {
case UCSI_ERROR_INCOMPATIBLE_PARTNER:
return -EOPNOTSUPP;
case UCSI_ERROR_CC_COMMUNICATION_ERR:
return -ECOMM;
case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
return -EPROTO;
case UCSI_ERROR_DEAD_BATTERY:
dev_warn(ucsi->dev, "Dead battery condition!\n");
return -EPERM;
case UCSI_ERROR_INVALID_CON_NUM:
case UCSI_ERROR_UNREGONIZED_CMD:
case UCSI_ERROR_INVALID_CMD_ARGUMENT:
dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error);
return -EINVAL;
case UCSI_ERROR_OVERCURRENT:
dev_warn(ucsi->dev, "Overcurrent condition\n");
break;
case UCSI_ERROR_PARTNER_REJECTED_SWAP:
dev_warn(ucsi->dev, "Partner rejected swap\n");
break;
case UCSI_ERROR_HARD_RESET:
dev_warn(ucsi->dev, "Hard reset occurred\n");
break;
case UCSI_ERROR_PPM_POLICY_CONFLICT:
dev_warn(ucsi->dev, "PPM Policy conflict\n");
break;
case UCSI_ERROR_SWAP_REJECTED:
dev_warn(ucsi->dev, "Swap rejected\n");
break;
case UCSI_ERROR_UNDEFINED:
default:
dev_err(ucsi->dev, "unknown error %u\n", error);
break;
}
return -EIO;
}
static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
{
u32 cci;
int ret;
ret = ucsi->ops->sync_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
if (ret)
return ret;
ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
if (ret)
return ret;
if (cci & UCSI_CCI_BUSY)
return -EBUSY;
if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
return -EIO;
if (cci & UCSI_CCI_NOT_SUPPORTED)
return -EOPNOTSUPP;
if (cci & UCSI_CCI_ERROR) {
if (cmd == UCSI_GET_ERROR_STATUS)
return -EIO;
return ucsi_read_error(ucsi);
}
return UCSI_CCI_LENGTH(cci);
}
int ucsi_send_command(struct ucsi *ucsi, u64 command,
void *data, size_t size)
{
u8 length;
int ret;
mutex_lock(&ucsi->ppm_lock);
ret = ucsi_exec_command(ucsi, command);
if (ret < 0)
goto out;
length = ret;
if (data) {
ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size);
if (ret)
goto out;
}
ret = ucsi_acknowledge_command(ucsi);
if (ret)
goto out;
ret = length;
out:
mutex_unlock(&ucsi->ppm_lock);
return ret;
}
EXPORT_SYMBOL_GPL(ucsi_send_command);
int ucsi_resume(struct ucsi *ucsi)
{
u64 command;
/* Restore UCSI notification enable mask after system resume */
command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
return ucsi_send_command(ucsi, command, NULL, 0);
}
EXPORT_SYMBOL_GPL(ucsi_resume);
/* -------------------------------------------------------------------------- */
void ucsi_altmode_update_active(struct ucsi_connector *con)
{
const struct typec_altmode *altmode = NULL;
u64 command;
int ret;
u8 cur;
int i;
command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur));
if (ret < 0) {
if (con->ucsi->version > 0x0100) {
dev_err(con->ucsi->dev,
"GET_CURRENT_CAM command failed\n");
return;
}
cur = 0xff;
}
if (cur < UCSI_MAX_ALTMODES)
altmode = typec_altmode_get_partner(con->port_altmode[cur]);
for (i = 0; con->partner_altmode[i]; i++)
typec_altmode_update_active(con->partner_altmode[i],
con->partner_altmode[i] == altmode);
}
static u8 ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid)
{
u8 mode = 1;
int i;
for (i = 0; alt[i]; i++)
if (alt[i]->svid == svid)
mode++;
return mode;
}
static int ucsi_next_altmode(struct typec_altmode **alt)
{
int i = 0;
for (i = 0; i < UCSI_MAX_ALTMODES; i++)
if (!alt[i])
return i;
return -ENOENT;
}
static int ucsi_register_altmode(struct ucsi_connector *con,
struct typec_altmode_desc *desc,
u8 recipient)
{
struct typec_altmode *alt;
bool override;
int ret;
int i;
override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE);
switch (recipient) {
case UCSI_RECIPIENT_CON:
i = ucsi_next_altmode(con->port_altmode);
if (i < 0) {
ret = i;
goto err;
}
desc->mode = ucsi_altmode_next_mode(con->port_altmode,
desc->svid);
switch (desc->svid) {
case USB_TYPEC_DP_SID:
alt = ucsi_register_displayport(con, override, i, desc);
break;
case USB_TYPEC_NVIDIA_VLINK_SID:
if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO)
alt = typec_port_register_altmode(con->port,
desc);
else
alt = ucsi_register_displayport(con, override,
i, desc);
break;
default:
alt = typec_port_register_altmode(con->port, desc);
break;
}
if (IS_ERR(alt)) {
ret = PTR_ERR(alt);
goto err;
}
con->port_altmode[i] = alt;
break;
case UCSI_RECIPIENT_SOP:
i = ucsi_next_altmode(con->partner_altmode);
if (i < 0) {
ret = i;
goto err;
}
desc->mode = ucsi_altmode_next_mode(con->partner_altmode,
desc->svid);
alt = typec_partner_register_altmode(con->partner, desc);
if (IS_ERR(alt)) {
ret = PTR_ERR(alt);
goto err;
}
con->partner_altmode[i] = alt;
break;
default:
return -EINVAL;
}
trace_ucsi_register_altmode(recipient, alt);
return 0;
err:
dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n",
desc->svid, desc->mode);
return ret;
}
static int
ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient)
{
int max_altmodes = UCSI_MAX_ALTMODES;
struct typec_altmode_desc desc;
struct ucsi_altmode alt;
struct ucsi_altmode orig[UCSI_MAX_ALTMODES];
struct ucsi_altmode updated[UCSI_MAX_ALTMODES];
struct ucsi *ucsi = con->ucsi;
bool multi_dp = false;
u64 command;
int ret;
int len;
int i;
int k = 0;
if (recipient == UCSI_RECIPIENT_CON)
max_altmodes = con->ucsi->cap.num_alt_modes;
memset(orig, 0, sizeof(orig));
memset(updated, 0, sizeof(updated));
/* First get all the alternate modes */
for (i = 0; i < max_altmodes; i++) {
memset(&alt, 0, sizeof(alt));
command = UCSI_GET_ALTERNATE_MODES;
command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_ALTMODE_OFFSET(i);
len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt));
/*
* We are collecting all altmodes first and then registering.
* Some type-C device will return zero length data beyond last
* alternate modes. We should not return if length is zero.
*/
if (len < 0)
return len;
/* We got all altmodes, now break out and register them */
if (!len || !alt.svid)
break;
orig[k].mid = alt.mid;
orig[k].svid = alt.svid;
k++;
}
/*
* Update the original altmode table as some ppms may report
* multiple DP altmodes.
*/
if (recipient == UCSI_RECIPIENT_CON)
multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated);
/* now register altmodes */
for (i = 0; i < max_altmodes; i++) {
memset(&desc, 0, sizeof(desc));
if (multi_dp && recipient == UCSI_RECIPIENT_CON) {
desc.svid = updated[i].svid;
desc.vdo = updated[i].mid;
} else {
desc.svid = orig[i].svid;
desc.vdo = orig[i].mid;
}
desc.roles = TYPEC_PORT_DRD;
if (!desc.svid)
return 0;
ret = ucsi_register_altmode(con, &desc, recipient);
if (ret)
return ret;
}
return 0;
}
static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient)
{
int max_altmodes = UCSI_MAX_ALTMODES;
struct typec_altmode_desc desc;
struct ucsi_altmode alt[2];
u64 command;
int num;
int ret;
int len;
int j;
int i;
if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS))
return 0;
if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0])
return 0;
if (con->ucsi->ops->update_altmodes)
return ucsi_register_altmodes_nvidia(con, recipient);
if (recipient == UCSI_RECIPIENT_CON)
max_altmodes = con->ucsi->cap.num_alt_modes;
for (i = 0; i < max_altmodes;) {
memset(alt, 0, sizeof(alt));
command = UCSI_GET_ALTERNATE_MODES;
command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_ALTMODE_OFFSET(i);
len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt));
if (len <= 0)
return len;
/*
* This code is requesting one alt mode at a time, but some PPMs
* may still return two. If that happens both alt modes need be
* registered and the offset for the next alt mode has to be
* incremented.
*/
num = len / sizeof(alt[0]);
i += num;
for (j = 0; j < num; j++) {
if (!alt[j].svid)
return 0;
memset(&desc, 0, sizeof(desc));
desc.vdo = alt[j].mid;
desc.svid = alt[j].svid;
desc.roles = TYPEC_PORT_DRD;
ret = ucsi_register_altmode(con, &desc, recipient);
if (ret)
return ret;
}
}
return 0;
}
static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient)
{
const struct typec_altmode *pdev;
struct typec_altmode **adev;
int i = 0;
switch (recipient) {
case UCSI_RECIPIENT_CON:
adev = con->port_altmode;
break;
case UCSI_RECIPIENT_SOP:
adev = con->partner_altmode;
break;
default:
return;
}
while (adev[i]) {
if (recipient == UCSI_RECIPIENT_SOP &&
(adev[i]->svid == USB_TYPEC_DP_SID ||
(adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID &&
adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) {
pdev = typec_altmode_get_partner(adev[i]);
ucsi_displayport_remove_partner((void *)pdev);
}
typec_unregister_altmode(adev[i]);
adev[i++] = NULL;
}
}
static void ucsi_get_pdos(struct ucsi_connector *con, int is_partner)
{
struct ucsi *ucsi = con->ucsi;
u64 command;
int ret;
command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner);
command |= UCSI_GET_PDOS_NUM_PDOS(UCSI_MAX_PDOS - 1);
command |= UCSI_GET_PDOS_SRC_PDOS;
ret = ucsi_send_command(ucsi, command, con->src_pdos,
sizeof(con->src_pdos));
if (ret < 0) {
dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
return;
}
con->num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */
if (ret == 0)
dev_warn(ucsi->dev, "UCSI_GET_PDOS returned 0 bytes\n");
}
static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
{
switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
case UCSI_CONSTAT_PWR_OPMODE_PD:
con->rdo = con->status.request_data_obj;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
ucsi_get_pdos(con, 1);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
break;
default:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
break;
}
}
static int ucsi_register_partner(struct ucsi_connector *con)
{
u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags);
struct typec_partner_desc desc;
struct typec_partner *partner;
if (con->partner)
return 0;
memset(&desc, 0, sizeof(desc));
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
desc.accessory = TYPEC_ACCESSORY_DEBUG;
break;
case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
desc.accessory = TYPEC_ACCESSORY_AUDIO;
break;
default:
break;
}
desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
partner = typec_register_partner(con->port, &desc);
if (IS_ERR(partner)) {
dev_err(con->ucsi->dev,
"con%d: failed to register partner (%ld)\n", con->num,
PTR_ERR(partner));
return PTR_ERR(partner);
}
con->partner = partner;
return 0;
}
static void ucsi_unregister_partner(struct ucsi_connector *con)
{
if (!con->partner)
return;
ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
typec_unregister_partner(con->partner);
con->partner = NULL;
}
static void ucsi_partner_change(struct ucsi_connector *con)
{
int ret;
if (!con->partner)
return;
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
/* Complete pending data role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
/* Can't rely on Partner Flags field. Always checking the alt modes. */
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
if (ret)
dev_err(con->ucsi->dev,
"con%d: failed to register partner alternate modes\n",
con->num);
else
ucsi_altmode_update_active(con);
}
static void ucsi_handle_connector_change(struct work_struct *work)
{
struct ucsi_connector *con = container_of(work, struct ucsi_connector,
work);
struct ucsi *ucsi = con->ucsi;
enum typec_role role;
u64 command;
int ret;
mutex_lock(&con->lock);
command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(ucsi, command, &con->status,
sizeof(con->status));
if (ret < 0) {
dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
__func__, ret);
goto out_unlock;
}
role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE ||
con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE)
ucsi_pwr_opmode_change(con);
if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
typec_set_pwr_role(con->port, role);
/* Complete pending power role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
}
if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
typec_set_pwr_role(con->port, role);
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
if (con->status.flags & UCSI_CONSTAT_CONNECTED)
ucsi_register_partner(con);
else
ucsi_unregister_partner(con);
}
if (con->status.change & UCSI_CONSTAT_CAM_CHANGE) {
/*
* We don't need to know the currently supported alt modes here.
* Running GET_CAM_SUPPORTED command just to make sure the PPM
* does not get stuck in case it assumes we do so.
*/
command = UCSI_GET_CAM_SUPPORTED;
command |= UCSI_CONNECTOR_NUMBER(con->num);
ucsi_send_command(con->ucsi, command, NULL, 0);
}
if (con->status.change & UCSI_CONSTAT_PARTNER_CHANGE)
ucsi_partner_change(con);
ret = ucsi_acknowledge_connector_change(ucsi);
if (ret)
dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
trace_ucsi_connector_change(con->num, &con->status);
out_unlock:
clear_bit(EVENT_PENDING, &ucsi->flags);
mutex_unlock(&con->lock);
}
/**
* ucsi_connector_change - Process Connector Change Event
* @ucsi: UCSI Interface
* @num: Connector number
*/
void ucsi_connector_change(struct ucsi *ucsi, u8 num)
{
struct ucsi_connector *con = &ucsi->connector[num - 1];
if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) {
dev_dbg(ucsi->dev, "Bogus connector change event\n");
return;
}
if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
schedule_work(&con->work);
}
EXPORT_SYMBOL_GPL(ucsi_connector_change);
/* -------------------------------------------------------------------------- */
static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
{
u64 command;
command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num);
command |= hard ? UCSI_CONNECTOR_RESET_HARD : 0;
return ucsi_send_command(con->ucsi, command, NULL, 0);
}
static int ucsi_reset_ppm(struct ucsi *ucsi)
{
u64 command = UCSI_PPM_RESET;
unsigned long tmo;
u32 cci;
int ret;
mutex_lock(&ucsi->ppm_lock);
ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL, &command,
sizeof(command));
if (ret < 0)
goto out;
tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
do {
if (time_is_before_jiffies(tmo)) {
ret = -ETIMEDOUT;
goto out;
}
ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
if (ret)
goto out;
/* If the PPM is still doing something else, reset it again. */
if (cci & ~UCSI_CCI_RESET_COMPLETE) {
ret = ucsi->ops->async_write(ucsi, UCSI_CONTROL,
&command,
sizeof(command));
if (ret < 0)
goto out;
}
msleep(20);
} while (!(cci & UCSI_CCI_RESET_COMPLETE));
out:
mutex_unlock(&ucsi->ppm_lock);
return ret;
}
static int ucsi_role_cmd(struct ucsi_connector *con, u64 command)
{
int ret;
ret = ucsi_send_command(con->ucsi, command, NULL, 0);
if (ret == -ETIMEDOUT) {
u64 c;
/* PPM most likely stopped responding. Resetting everything. */
ucsi_reset_ppm(con->ucsi);
c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy;
ucsi_send_command(con->ucsi, c, NULL, 0);
ucsi_reset_connector(con, true);
}
return ret;
}
static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
{
struct ucsi_connector *con = typec_get_drvdata(port);
u8 partner_type;
u64 command;
int ret = 0;
mutex_lock(&con->lock);
if (!con->partner) {
ret = -ENOTCONN;
goto out_unlock;
}
partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags);
if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
role == TYPEC_DEVICE) ||
(partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
role == TYPEC_HOST))
goto out_unlock;
command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_SET_UOR_ROLE(role);
command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS;
ret = ucsi_role_cmd(con, command);
if (ret < 0)
goto out_unlock;
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
ret = -ETIMEDOUT;
out_unlock:
mutex_unlock(&con->lock);
return ret < 0 ? ret : 0;
}
static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
{
struct ucsi_connector *con = typec_get_drvdata(port);
enum typec_role cur_role;
u64 command;
int ret = 0;
mutex_lock(&con->lock);
if (!con->partner) {
ret = -ENOTCONN;
goto out_unlock;
}
cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
if (cur_role == role)
goto out_unlock;
command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_SET_PDR_ROLE(role);
command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS;
ret = ucsi_role_cmd(con, command);
if (ret < 0)
goto out_unlock;
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) {
ret = -ETIMEDOUT;
goto out_unlock;
}
/* Something has gone wrong while swapping the role */
if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=
UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_reset_connector(con, true);
ret = -EPROTO;
}
out_unlock:
mutex_unlock(&con->lock);
return ret;
}
static const struct typec_operations ucsi_ops = {
.dr_set = ucsi_dr_swap,
.pr_set = ucsi_pr_swap
};
static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
{
struct fwnode_handle *fwnode;
int i = 1;
device_for_each_child_node(con->ucsi->dev, fwnode)
if (i++ == con->num)
return fwnode;
return NULL;
}
static int ucsi_register_port(struct ucsi *ucsi, int index)
{
struct ucsi_connector *con = &ucsi->connector[index];
struct typec_capability *cap = &con->typec_cap;
enum typec_accessory *accessory = cap->accessory;
u64 command;
int ret;
INIT_WORK(&con->work, ucsi_handle_connector_change);
init_completion(&con->complete);
mutex_init(&con->lock);
con->num = index + 1;
con->ucsi = ucsi;
/* Delay other interactions with the con until registration is complete */
mutex_lock(&con->lock);
/* Get connector capability */
command = UCSI_GET_CONNECTOR_CAPABILITY;
command |= UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap));
if (ret < 0)
goto out;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
cap->data = TYPEC_PORT_DRD;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
cap->data = TYPEC_PORT_DFP;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
cap->data = TYPEC_PORT_UFP;
if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) &&
(con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER))
cap->type = TYPEC_PORT_DRP;
else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER)
cap->type = TYPEC_PORT_SRC;
else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)
cap->type = TYPEC_PORT_SNK;
cap->revision = ucsi->cap.typec_version;
cap->pd_revision = ucsi->cap.pd_version;
cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)
*accessory++ = TYPEC_ACCESSORY_AUDIO;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY)
*accessory = TYPEC_ACCESSORY_DEBUG;
cap->fwnode = ucsi_find_fwnode(con);
cap->driver_data = con;
cap->ops = &ucsi_ops;
ret = ucsi_register_port_psy(con);
if (ret)
goto out;
/* Register the connector */
con->port = typec_register_port(ucsi->dev, cap);
if (IS_ERR(con->port)) {
ret = PTR_ERR(con->port);
goto out;
}
/* Alternate modes */
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON);
if (ret) {
dev_err(ucsi->dev, "con%d: failed to register alt modes\n",
con->num);
goto out;
}
/* Get the status */
command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
if (ret < 0) {
dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
ret = 0;
goto out;
}
ret = 0; /* ucsi_send_command() returns length on success */
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
/* Check if there is already something connected */
if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
typec_set_pwr_role(con->port,
!!(con->status.flags & UCSI_CONSTAT_PWR_DIR));
ucsi_pwr_opmode_change(con);
ucsi_register_partner(con);
}
if (con->partner) {
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
if (ret) {
dev_err(ucsi->dev,
"con%d: failed to register alternate modes\n",
con->num);
ret = 0;
} else {
ucsi_altmode_update_active(con);
}
}